<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <h1 v-color>hello wolrd</h1>
  </div>

  <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.9/vue.min.js"></script>
  <script>

    new Vue({
      el: '#app',
      directives: {
        color: {
          bind(el) {
            el.style.color = 'yellow'
          }
        }
      }
    })
  </script>
</body>

</html>